D-tyrosyl-tRNA(Tyr) metabolism in Saccharomyces cerevisiae.

Abstract : The Saccharomyces cerevisiae YDL219w (DTD1) gene, which codes for an amino acid sequence sharing 34% identity with the Escherichia coli D-Tyr-tRNA(Tyr) deacylase, was cloned, and its product was functionally characterized. Overexpression in the yeast of the DTD1 gene from a multicopy plasmid increased D-Tyr-tRNA(Tyr) deacylase activity in crude extracts by two orders of magnitude. Upon disruption of the chromosomal gene, deacylase activity was decreased by more than 90%, and the sensitivity to D-tyrosine of the growth of S. cerevisiae was exacerbated. The toxicity of D-tyrosine was also enhanced under conditions of nitrogen starvation, which stimulate the uptake of D-amino acids. In relation with these behaviors, the capacity of purified S. cerevisiae tyrosyl-tRNA synthetase to produce D-Tyr-tRNA(Tyr) could be shown. Finally, the phylogenetic distribution of genes homologous to DTD1 was examined in connection with L-tyrosine prototrophy or auxotrophy. In the auxotrophs, DTD1-like genes are systematically absent. In the prototrophs, the putative occurrence of a deacylase is variable. It possibly depends on the L-tyrosine anabolic pathway adopted by the cell.
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J. Soutourina, Sylvain Blanquet, Pierre Plateau. D-tyrosyl-tRNA(Tyr) metabolism in Saccharomyces cerevisiae.. Journal of Biological Chemistry, American Society for Biochemistry and Molecular Biology, 2000, 275 (16), pp.11626-30. ⟨10.1074/jbc.275.16.11626⟩. ⟨hal-00771806⟩

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